The number of bytes that have been read from the network by the
cache node.

Bytes

BytesUsedForCacheItems

The number of bytes used to store cache items.

Bytes

BytesWrittenOutFromMemcached

The number of bytes that have been written to the network by the
cache node.

Bytes

CasBadval

The number of CAS (check and set) requests the cache has received
where the Cas value did not match the Cas value stored.

Count

CasHits

The number of Cas requests the cache has received where the
requested key was found and the Cas value matched.

Count

CasMisses

The number of Cas requests the cache has received where the key
requested was not found.

Count

CmdFlush

The number of flush commands the cache has received.

Count

CmdGet

The number of get commands the cache has received.

Count

CmdSet

The number of set commands the cache has received.

Count

CurrConnections

A count of the number of connections connected to the cache at an
instant in time. ElastiCache uses two to three of the connections to monitor the cluster
in each case.

Count

CurrItems

A count of the number of items currently stored in the cache.

Count

DecrHits

The number of decrement requests the cache has received where the
requested key was found.

Count

DecrMisses

The number of decrement requests the cache has received where the
requested key was not found.

Count

DeleteHits

The number of delete requests the cache has received where the
requested key was found.

Count

DeleteMisses

The number of delete requests the cache has received where the
requested key was not found.

Count

Evictions

The number of non-expired items the cache evicted to allow space for
new writes.

Count

GetHits

The number of get requests the cache has received where the key
requested was found.

Count

GetMisses

The number of get requests the cache has received where the key
requested was not found.

Count

IncrHits

The number of increment requests the cache has received where the
key requested was found.

Count

IncrMisses

The number of increment requests the cache has received where the
key requested was not found.

Count

Reclaimed

The number of expired items the cache evicted to allow space for new
writes.

Count

For Memcached 1.4.14, the following additional metrics are provided.

Metric

Description

Unit

BytesUsedForHash

The number of bytes currently used by hash tables.

Bytes

CmdConfigGet

The cumulative number of config get requests.

Count

CmdConfigSet

The cumulative number of config set requests.

Count

CmdTouch

The cumulative number of touch requests.

Count

CurrConfig

The current number of configurations stored.

Count

EvictedUnfetched

The number of valid items evicted from the least recently used cache
(LRU) which were never touched after being set.

Count

ExpiredUnfetched

The number of expired items reclaimed from the LRU which were never
touched after being set.

Count

SlabsMoved

The total number of slab pages that have been moved.

Count

TouchHits

The number of keys that have been touched and were given a new
expiration time.

Count

TouchMisses

The number of items that have been touched, but were not found.

Count

The AWS/ElastiCache namespace includes the following calculated cache-level metrics.

Metric

Description

Unit

NewConnections

The number of new connections the cache has received. This is
derived from the memcached total_connections statistic by recording the
change in total_connections across a period of time. This will always be
at least 1, due to a connection reserved for a ElastiCache.

Count

NewItems

The number of new items the cache has stored. This is derived from
the memcached total_items statistic by recording the change in
total_items across a period of time.

Count

UnusedMemory

The amount of memory not used by data.
This is derived from the Memcached statistics
limit_maxbytes and bytes
by subtracting bytes from
limit_maxbytes.

Because Memcached overhead uses memory in addition
to that used by data, UnusedMemory should
not be considered to be the amount of memory available
for additional data. You may experience evictions even
though you still have some unused memory.